Use with the knife when turning slender shaft, generating what ＂bamboo-shaped＂

Use with the knife while turning slender shaft, have a "bamboo-shaped" because the contact pressure with the tool holder claw support with the workpiece is too large.

The correct approach is to use with the knife:

Distance ⑴, claw support on the machined surface of the support position within the tool between 10mm.
⑵, control of cut back, the entire axial length margin on bad hair can be removed, leaving black scars and scarring.
⑶, press up, down, on the order, with the feel, hearing, visual and other methods to adjust support to the outer claw up the slightest contact, make each nail to keep the same small space, and freedom of movement.
⑷, time tracking and monitoring of exposure each support claw, and to ensure good lubrication.